A flag-waver? Something more complicated? What sort of a relationship to the flag do people want of their candidate? Or, to take the picture literally: what sort of flag is gesturing to the crowd?--since what one sees is a flag making a speech.
Then look at the crowd, their clothes and faces. Could they not be a political audience of the 1940s or 1950s, of almost any era really? One begins to dream back into the entire history of presidential campaigns, the history of American politics itself--all because the black-and-white depiction has removed the distraction of color. Yet somehow black-and-white makes the color more vivid, because one knows that the color is there. Recall the movie